Running in background before .start is called

[nc14]

I'm running the code below but the countdown is starting in the background before .start is called. i.e. I'm arriving at the page, the timer shows the correct time and isn't moving, but when I hit the IB action (startWorkoutPressed) to start the timer, it 'jumps' to however long has passed since I loaded the page.

Have I got this configured wrong or is this a bug?

override func viewDidLoad() {
        super.viewDidLoad()
        let finalTime = Double(timeForWorkout)
        timerLabel.setCountDownTime(minutes: (finalTime)*60)
       
    }
    
    @IBAction func startWorkoutPressed(_ sender: UIButton) {
        
        timerLabel.start()
        
    }

[nc14]

I can fix this by adding timerLabel.pause() to viewDidLoad but this doesn't seem very elegant?